You're completely wrong. They grow so fast because the nutrients are readily available to the plants at all times, more oxygen at the root zone, and less energy is spent mining for nutrients. Every growing style has its pros and cons. Hydro is really fast, but you get a hydro taste. Organic tends to produce more resins and terpenes, but grow slower. Inert medium like coco/peat is somewhat a hybrid of both. Any one of those methods produces really good bud if you know what you're doing. I routinely share my salt-grown buds with people who grow in living soil and I'll tell you this, you can tell the difference between salt-based and organic, but the quality difference between mine and theirs isn't there. Grow however you are comfortable with and get good at it.

Of course it is. The vegetables I grow at home are a lot better than what's available at the store.

Research beneficial nematodes. They’re basically assassins for your plants. Releasing these and maybe some predatory mites will keep all the bad crawlers in check. Just don't use chemicals on your soil, they will destroy all that nice microbiology you have going. 🌱💚

All that the plants need is in the nutrient solution that's given to them on a daily basis. The coco only provides an inert base for the roots to work through and support the main stalk. This is basically hydro, without the buckets.